Octave Chanute to Wilbur Wright

The custom is to keep the room lighted while the speaker makes his
introductory remarks, and then to turn the lights out when the pictures
are to be shown, leaving a shaded light for the speaker to read by.
Diagrams can be used during the introductory, or photographed to throw upon
the screen during the illustrated part. The meetings are informal and the
members attend in business dress. We will conform to your wishes in not
making your address unduly prominent, and will decide as to the presence
of ladies after canvassing the probable attendance. We generally have 50 to
75 members present.